CN108322738B - Alignment method of 360-degree panoramic camera module - Google Patents
Alignment method of 360-degree panoramic camera module Download PDFInfo
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- CN108322738B CN108322738B CN201810166858.3A CN201810166858A CN108322738B CN 108322738 B CN108322738 B CN 108322738B CN 201810166858 A CN201810166858 A CN 201810166858A CN 108322738 B CN108322738 B CN 108322738B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
Abstract
The invention discloses a 360-degree panoramic camera module alignment method, which is characterized in that a first image of a test panel is collected through a first camera module, active calibration equipment carries out position calibration on the first camera module based on the first image so as to adjust the optical center and the analytic force of the first camera module, then a second image of the test panel is collected through a second camera module, the first camera module is used as a reference standard, optical axis difference information of the first camera module and the second camera module is obtained, the optical center and the analytic force of the second camera module are adjusted, accurate position calibration of two camera modules in the 360-degree panoramic camera module can be realized, and the image quality is improved.
Description
Technical Field
The invention relates to the technical field of camera modules, in particular to a 360-degree panoramic camera module alignment method.
Background
With the continuous development of scientific technology, more and more electronic devices with image acquisition functions are widely applied to daily life and work of people, bring great convenience to the daily life and work of people, and become an indispensable important tool in the life of people at present.
The main part of the electronic equipment for realizing the image acquisition function is the camera module, and the 360-degree panoramic camera module is formed into the current commonly-used camera module along with the continuous improvement of the user on the imaging requirement. The commonly used 360-degree panoramic camera module is formed by packaging two camera modules which are arranged back to back, and when panoramic imaging is carried out, images collected by the two camera modules respectively are fused and spliced, so that a panoramic image can be formed.
In order to ensure the image quality of the panoramic image and enable the panoramic image to be in continuous transition at the splicing position of the two images, the positions of the two camera modules need to be corrected, and the inclination tolerance of the optical axis is combined with a standard condition. How to realize the accurate position correction of two camera modules is a problem to be solved urgently in the field.
Disclosure of Invention
In order to solve the problems, the technical scheme of the invention provides an alignment method of a 360-degree panoramic camera module, which can realize accurate position correction of two camera modules in the 360-degree panoramic camera module and improve the image quality.
In order to achieve the above purpose, the invention provides the following technical scheme:
an alignment method of a 360-degree panoramic camera module comprises the following steps:
providing a support, wherein a first photosensitive chip and a second photosensitive chip are respectively fixed on two opposite sides of the support;
arranging a first lens module on one side of the first photosensitive chip;
acquiring preset image information of a test panel through a first camera module to generate a first image; the first camera module comprises the first lens module and the first photosensitive chip;
the active calibration equipment is used for carrying out position calibration on the first lens module based on the first image so as to adjust the optical center and the resolving power of the first camera module;
fixing the first lens module and the bracket, and rotating the bracket to enable the second photosensitive chip to be opposite to the test panel;
positioning the current optical axis position of the first camera module after rotation, and arranging a second lens module at one side of the bracket, which is provided with the second photosensitive chip;
acquiring a second image of the test panel through a second camera module, wherein the second camera module comprises a second lens module and a second photosensitive chip;
acquiring optical axis difference information of the first camera module and the second camera module based on the second image and the current optical axis position of the first camera module after rotation;
adjusting the optical center and the resolving power of the second camera module based on the optical axis difference information;
and fixing the second lens module and the bracket.
Preferably, in the above alignment method, the test panel has a first graphic mark and a second graphic mark;
the position correction of the first lens module by the first image through the active calibration device comprises:
the optical center position of the first camera module is corrected through the image information corresponding to the first graphic mark in the first image, and the optical center of the first camera module and the center of the image information corresponding to the first graphic mark meet the standard position relation;
and adjusting the resolving power of the first camera module through the image information corresponding to the second graphic mark in the first image, so that the resolving power of the first camera module meets the threshold condition.
Preferably, in the above alignment method, the test panel includes: a transparent substrate; the first graphic mark and the second graphic mark are non-transparent geometric figures arranged on the surface of the transparent substrate;
wherein the first graphic mark is a circular ring, and the second graphic mark is a rectangle.
Preferably, in the alignment method, the positioning the current optical axis position after the first camera module rotates includes:
a spherical light source is arranged on one side of the bracket, on which the first camera module is fixed;
the active calibration equipment acquires the image of the spherical light source acquired by the first camera module, and positions the current optical axis position of the first camera module based on the image.
Preferably, in the above alignment method, the spherical light source includes: the light-emitting concave spherical surface is provided with an opening, and the opening is opposite to the first lens module.
Preferably, in the above alignment method, the fixing the first lens module and the holder includes:
UV glue is arranged between the first lens module and the support, and the UV glue is solidified through ultraviolet irradiation so as to bond and fix the first lens module and the support.
Preferably, in the above alignment method, the fixing the second lens module and the holder includes:
and UV glue is arranged between the second lens module and the bracket and is cured through ultraviolet irradiation so as to bond and fix the second lens module and the bracket.
As can be seen from the above description, in the alignment method of the 360 ° panoramic camera module according to the technical solution of the present invention, a first image of a test panel is collected by a first camera module, an active calibration device performs position calibration on the first lens module based on the first image to adjust an optical center and an analytic force of the first camera module, then a second image of the test panel is collected by a second camera module, optical axis difference information between the first camera module and the second camera module is obtained by using the first camera module as a reference standard, the optical center and the analytic force of the second camera module are adjusted, so that accurate position calibration of two camera modules in the 360 ° panoramic camera module can be achieved, and image quality is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart of an alignment method for a 360 ° panoramic camera module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a test panel according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a principle that a first camera module acquires a first image according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a principle of positioning a current optical axis of a first camera module and disposing a second lens module on another side of a bracket according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a 360-degree panoramic camera module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, fig. 1 is a schematic flow chart of an alignment method for a 360 ° panoramic camera module according to an embodiment of the present invention, where the alignment method includes:
step S11: and providing a support, wherein a first photosensitive chip and a second photosensitive chip are respectively fixed on two opposite sides of the support.
Specifically, a first circuit board and a second circuit board are respectively fixed on two opposite sides of the support. The first photosensitive chip is bound on the first circuit board, and the second photosensitive chip is bound on the second circuit board. A first lens mount is fixed on the first circuit board, and a first photosensitive chip is located in the first lens mount. And a second lens mount is fixed on the second circuit board, and the second photosensitive chip is positioned in the second lens mount.
Step S12: and a first lens module is arranged on one side of the first photosensitive chip.
The stand is placed on the operating platform of an active calibration device (AA device). Snatch first camera lens module through snatching equipment, place at first sensitization chip and deviate from one side of second sensitization chip. UV glue may be disposed between the periphery of the first lens module and the holder so as to fix the first lens module and the holder after the position of the first lens module is corrected.
Step S13: and acquiring preset image information of the test panel through the first camera module to generate a first image.
The first camera module comprises the first lens module and the first photosensitive chip.
Fig. 2 shows the test panel, and fig. 2 is a schematic structural diagram of the test panel according to an embodiment of the present invention, where the test panel has a first graphic mark 11 and a second graphic mark 12. Specifically, the test panel includes: a transparent substrate 10; the first graphic mark 11 and the second graphic mark 12 are non-transparent geometric figures disposed on the surface of the transparent substrate 10. In the mode shown in fig. 2, the first graphic mark 11 is a circular ring and is used for determining the optical center of the camera module, and the second graphic mark 12 is a rectangular ring and is used for actively calibrating the resolving power of the camera module, where the resolving power is the definition of the camera module for shooting an object. In fig. 2, the white area is a transparent area, and the shaded filling portion is a non-transparent area. Optionally, the first graphic mark 11 and the second graphic mark are located within a rectangular box 13, which is opaque to light.
When a first image is collected by the first camera module, as shown in fig. 3, fig. 3 is a schematic diagram of a principle that the first camera module collects the first image according to an embodiment of the present invention, one side of the bracket 20 has a first circuit board 21, a first photosensitive chip is bound to the first circuit board 21, and the first photosensitive chip is not shown in fig. 3. A first lens holder 22 is fixed to the first circuit board 21. The first lens module 23 is placed at the opening of the first lens holder 22, and a UV adhesive is arranged between the first lens module and the first lens holder, and after the subsequent position calibration is completed, the UV adhesive is cured to enable the first lens module and the second lens holder to be bonded and fixed. In fig. 3, a second circuit board and a second lens mount are fixed to the other side of the bracket 20, a second photosensitive chip is bound to the second circuit board, and the second circuit board, the second photosensitive chip and the second lens mount are not shown in fig. 3.
Step S14: and correcting the position of the first image to the first lens module through the active calibration equipment so as to adjust the optical center and the resolving power of the first camera module.
In this step, the performing, by the active calibration device, the position calibration of the first lens module on the first image includes: the optical center position of the first camera module is corrected through the image information corresponding to the first graphic mark in the first image, and the optical center of the first camera module and the center of the image information corresponding to the first graphic mark meet the standard position relation; and adjusting the resolving power of the first camera module through the image information corresponding to the second graphic mark in the first image, so that the resolving power of the first camera module meets the threshold condition. The purpose of the step can be realized through the function of correcting the image of the AA equipment special for the camera module.
Step S15: and fixing the first lens module and the support, and rotating the support to ensure that the second photosensitive chip is just opposite to the test panel.
The optical axes of the camera modules are all parallel to the horizontal plane, the test panel is perpendicular to the horizontal plane, and at the moment, the support needs to be rotated horizontally, so that the second photosensitive chip is opposite to the test panel.
In this step, the fixing of the first lens module and the holder includes: UV glue is arranged between the first lens module and the support, and the UV glue is solidified through ultraviolet irradiation so as to bond and fix the first lens module and the support.
Step S16: and positioning the current optical axis position of the first camera module after rotation, and arranging a second lens module on one side of the support, which is provided with the second photosensitive chip.
As shown in fig. 4, fig. 4 is a schematic diagram of a principle of positioning a current optical axis of a first camera module and disposing a second lens module on another side of a bracket according to an embodiment of the present invention. After the support 20 is rotated through the above steps, the second photosensitive chip on the other side of the support 20 faces the test panel. The other side of the support 20 has a second circuit board 31 on which a second photosensitive chip is bound. A second lens mount 32 is fixed on the second circuit board 31, and the second photosensitive chip is located in the second lens mount 32. The second lens module 33 is placed at the opening of the second lens holder 32 with UV glue therebetween, and after the position calibration is completed, the UV glue is cured to fix the two. The second photosensitive chip is not shown in fig. 4.
In this step, the positioning the current optical axis position after the first camera module rotates includes: as shown in fig. 4, a spherical light source 41 is disposed on one side of the bracket 20 to which the first camera module is fixed; the active calibration device obtains the image of the spherical light source 41 collected by the first camera module, and the active calibration device can position the current optical axis position of the first camera module based on the image. Optionally, the spherical light source 41 includes: the light-emitting concave spherical surface 42 is provided with an opening, and the opening is opposite to the first lens module.
Step S17: and acquiring a second image of the test panel through a second camera module. The second camera module comprises the second lens module and the second photosensitive chip.
As shown in fig. 4, the second lens module faces the test panel, so that the second camera module can image the test panel to obtain a second image.
Step S18: and acquiring optical axis difference information of the first camera module and the second camera module based on the second image and the current optical axis position of the first camera module after rotation.
The AA device can locate its current optical axis position according to the image of the spherical light source 41 collected by the first camera module, and can also obtain optical axis difference information of the two camera modules according to the second image and the current optical axis position of the first camera module.
Step S19: and adjusting the optical center and the resolving power of the second camera module based on the optical axis difference information.
The AA equipment can adjust the optical center and the resolving power of the second camera module according to the optical axis difference information, so that the optical axis deviation of the two camera modules is smaller than a set threshold value.
Step S20: and fixing the second lens module and the bracket.
Optionally, the fixing the second lens module and the bracket includes: and UV glue is arranged between the second lens module and the bracket and is cured through ultraviolet irradiation so as to bond and fix the second lens module and the bracket. Finally, the formed 360-degree panoramic camera module is as shown in fig. 5, and fig. 5 is a schematic structural view of the 360-degree panoramic camera module provided by the embodiment of the invention.
According to the alignment method, a first image of a test panel is acquired through a first camera module, active calibration equipment carries out position calibration on the first camera module based on the first image so as to adjust the optical center and the resolving power of the first camera module, then a second image of the test panel is acquired through a second camera module, the first camera module is used as a reference standard to obtain optical axis difference information of the first camera module and the second camera module, the optical center and the resolving power of the second camera module are adjusted, accurate position calibration of the two camera modules in the 360-degree panoramic camera module can be achieved, and image quality is improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The alignment method for the 360-degree panoramic camera module is characterized by comprising the following steps of:
providing a support, wherein a first photosensitive chip and a second photosensitive chip are respectively fixed on two opposite sides of the support;
arranging a first lens module on one side of the first photosensitive chip;
acquiring preset image information of a test panel through a first camera module to generate a first image; the first camera module comprises the first lens module and the first photosensitive chip;
the active calibration equipment is used for carrying out position calibration on the first lens module based on the first image so as to adjust the optical center and the resolving power of the first camera module;
fixing the first lens module on the support, and rotating the support to enable the second photosensitive chip to be opposite to the test panel;
positioning the current optical axis position of the first camera module after rotation, and arranging a second lens module at one side of the bracket, which is provided with the second photosensitive chip;
acquiring a second image of the test panel through a second camera module, wherein the second camera module comprises a second lens module and a second photosensitive chip;
acquiring optical axis difference information of the first camera module and the second camera module based on the second image and the current optical axis position of the first camera module after rotation;
adjusting the optical center and the resolving power of the second camera module based on the optical axis difference information;
and fixing the second lens module on the bracket.
2. The alignment method according to claim 1, wherein the test panel has a first graphic mark and a second graphic mark;
the position correction of the first lens module comprises the following steps:
the optical center position of the first camera module is corrected through the image information corresponding to the first graphic mark in the first image, so that the optical center of the first camera module and the center of the image information corresponding to the first graphic mark meet a standard position relation;
and adjusting the resolving power of the first camera module through the image information corresponding to the second graphic mark in the first image, so that the resolving power of the first camera module meets the threshold condition.
3. The method of claim 2, wherein the test panel comprises: a transparent substrate; the first graphic mark and the second graphic mark are non-transparent geometric figures arranged on the surface of the transparent substrate;
wherein the first graphic mark is a circular ring, and the second graphic mark is a rectangle.
4. The alignment method according to claim 1, wherein the positioning the current optical axis position after the first camera module rotates comprises:
a spherical light source is arranged on one side of the bracket, on which the first camera module is fixed;
the active calibration equipment acquires the image of the spherical light source acquired by the first camera module, and positions the current optical axis position of the first camera module based on the image of the spherical light source.
5. The alignment method of claim 4, wherein the spherical light source comprises: the light-emitting concave spherical surface is provided with an opening, and the opening is opposite to the first lens module.
6. The alignment method according to any one of claims 1 to 5, wherein fixing the first lens module on the bracket comprises:
UV glue is arranged between the first lens module and the support, and the UV glue is solidified through ultraviolet irradiation so as to bond and fix the first lens module and the support.
7. The alignment method according to any one of claims 1 to 5, wherein fixing the second lens module on the bracket comprises:
and UV glue is arranged between the second lens module and the bracket and is cured through ultraviolet irradiation so as to bond and fix the second lens module and the bracket.
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| CN201810166858.3A CN108322738B (en) | 2018-02-28 | 2018-02-28 | Alignment method of 360-degree panoramic camera module |
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| CN110855856B (en) * | 2018-08-21 | 2021-06-18 | 宁波舜宇光电信息有限公司 | Assembling method of multi-group optical lens based on motor optical assembly |
| CN109089026A (en) * | 2018-08-28 | 2018-12-25 | 信利光电股份有限公司 | A kind of full-view camera mould group |
| EP3859419A4 (en) * | 2018-10-10 | 2021-10-27 | Ningbo Sunny Opotech Co., Ltd. | Optical zoom camera module and assembling method therefor |
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| KR100711570B1 (en) * | 2006-11-20 | 2007-04-27 | 에치디프로 주식회사 | Lens assembly adjustable bracket for panorama cctv camera |
| WO2014168974A1 (en) * | 2013-04-08 | 2014-10-16 | Omnivision Technologies, Inc. | Systems and methods for calibration of a 360 degree camera system |
| US20170127045A1 (en) * | 2015-10-28 | 2017-05-04 | Toppano Co., Ltd. | Image calibrating, stitching and depth rebuilding method of a panoramic fish-eye camera and a system thereof |
| CN105847665B (en) * | 2015-11-30 | 2018-09-04 | 维沃移动通信有限公司 | Dual camera capture apparatus and dual camera optical axis means for correcting |
| CN105611138A (en) * | 2016-03-21 | 2016-05-25 | 信利光电股份有限公司 | Double-camera module, assembling method thereof, and electronic device |
| CN106454046A (en) * | 2016-11-01 | 2017-02-22 | 信利光电股份有限公司 | 360-degree panoramic camera module and electronic equipment |
| CN106851059A (en) * | 2016-12-30 | 2017-06-13 | 奇鋐科技股份有限公司 | Photography module |
| CN106873112B (en) * | 2017-01-03 | 2019-01-22 | 深圳市比亚迪电子部品件有限公司 | A kind of dual camera assemble method |
| CN106686293B (en) * | 2017-02-20 | 2019-09-24 | 信利光电股份有限公司 | 360 degree of panoramic shooting mould groups of one kind and preparation method thereof |
| CN107071400A (en) * | 2017-05-31 | 2017-08-18 | 信利光电股份有限公司 | A kind of optical centre measuring system of wide-angle imaging module |
| CN107529001B (en) * | 2017-08-28 | 2020-07-24 | 信利光电股份有限公司 | Double-camera module carrying and aligning method |
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